Percentage Calculator: Simple and Fast

The Percentage Calculator is a free online tool that lets you solve all your percentage calculations in seconds. Whether you need to calculate a discount, an increase, or a proportional share, this tool gives you the answer instantly.

Simply select the type of calculation you need, enter your values, and get the result immediately along with the formula used.

How to Use

Choose the calculation type (X% of Y, what %, change)
Enter the numeric values
The result displays automatically
View the formula used to understand the calculation

Available Calculation Types

X% of Y

Calculates how much X percent of Y represents.

Example: 20% of 150 = 30

Formula: (X × Y) / 100

X is what % of Y?

Finds what percentage X represents of Y.

Example: 30 is 20% of 150

Formula: (X / Y) × 100

% Change

Calculates the percentage change between two values.

Example: From 100 to 150 = +50%

Formula: ((Y - X) / X) × 100

Common Use Cases

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Shopping and Discounts

Calculate the price after a discount: -30% off $89 = $62.30

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Personal Finance

Calculate your savings, savings rate, or budget evolution.

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Data Analysis

Compare figures, calculate growth rates, or market shares.

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Education

Verify your percentage calculations for homework or exams.

Understanding Percentages

Percentage: From Latin "per centum" (per hundred), it's a way to express a proportion out of 100.
Increase: A positive percentage indicates a rise (e.g., +10% = multiply by 1.10).
Decrease: A negative percentage indicates a drop (e.g., -20% = multiply by 0.80).
Tip: To quickly calculate X%, divide by 100 then multiply by X.

Practical Examples

Sales Tax: $100 item with 8% tax → 100 × 1.08 = $108 total

Sale: $80 item with -25% off → 80 × 0.75 = $60

Tip: $45 bill with 15% tip → 45 × 0.15 = $6.75 tip

Growth: Salary going from $2000 to $2200 → +10% raise

Percentage Calculator